Particle Image Velocimetry (PIV) Investigation of the Turbulent Airflow in Slot-Die Melt Blowing

Xie, Sheng; Jiang, Guojun; Ye, Bao-Lin; Shentu, Baoqing

doi:10.3390/polym12020279

Cited by 12 publications

(11 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to it becoming a popular method due to its application on producing high-efficiency air filters in industry [ 1 , 2 , 3 , 4 ], melt-blowing technology has been of increasing interest in recent years owing to the development of nanotechnology [ 5 , 6 , 7 , 8 , 9 ]. During the melt-blowing process, polymer melts are attenuated into micro/nanofibrous nonwovens with the help of high-speed hot air jets [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Measurement and Comparison of Melt-Blowing Airflow Fields: Nozzle Modifications to Reduce Turbulence and Fibre Whipping

Yang

Zeng

2021

Polymers

View full text Add to dashboard Cite

In the melt-blowing process, micro/nanofibrous nonwovens are attenuated and formed through aerodynamic force in a turbulent airflow field. In this work, two types of airflow-directors were added under a common melt-blowing slot-die nozzle to obtain modified airflow fields. The effect of airflow-directors on time-averaged characteristics, turbulence intensity, and temperature fluctuation intensity are achieved through the simultaneous measurement of fluctuating velocity and fluctuating temperature using a two-wire probe hot-wire anemometer. Moreover, the influence of airflow-directors on fibre oscillations are also investigated through high-speed photography. The distribution of turbulence intensity and temperature fluctuation intensity reveals the characteristics of fluctuating airflow fields formed by different melt-blowing slot-die nozzles. Through the analyses of airflow characteristics and fibre oscillations, we can find that the arrangement of airflow-directors has a great impact on both turbulence distribution and fibre oscillation.

show abstract

Section: Introductionmentioning

confidence: 99%

Measurement and Comparison of Melt-Blowing Airflow Fields: Nozzle Modifications to Reduce Turbulence and Fibre Whipping

Yang

Zeng

2021

Polymers

View full text Add to dashboard Cite

show abstract

“…A hot-wire anemometer was also applied for measuring the fluctuating velocity and temperature of melt-blown airflow. , The results showed that the temperature fluctuation revealed a regular profile like a sine or cosine curve; however, the velocity fluctuation was irregular. More recently, Xie et al explored the melt-blown air turbulence by particle image velocimetry (PIV); they found that the two ejected air jets from a pair of slots integrated immediately and began to form an S-shaped turbulent structure, and their work revealed the same structure of air turbulence and the specific fiber whipping motion in slot-die melt blowing.…”

Section: Introductionmentioning

confidence: 99%

Airflow, Fiber Dynamic Whipping, and Final Fiber Diameter in Flush Sharp-Die Melt Blowing with Different Air-Slot Widths

2021

Self Cite

View full text Add to dashboard Cite

Melt streams were attenuated into microfibers by high-speed airflow during melt blowing. The present work explored the effect of air-slot width on the fiber diameter and diameter evenness in flush sharp-die melt blowing. The airflow in different die melt blowing was first numerically simulated by the CFD approach. Then, the fiber dynamic whipping was captured by high-speed photography. Finally, a spinning experiment was implemented and the fiber diameters were measured. The result reveals that the sharp die with a larger air-slot width produces fibers with a larger diameter, but the uniformity is obviously better. This study reveals that the air flow, fiber whipping, and final fiber diameter are closely related to each other. The quality control of melt-blown fiber can be carried out by controlling the fiber whipping motion.

show abstract

“…12 Another technique called the particle image velocimetry (PIV) is used to measure the turbulent air flow field in the melt blowing process in an effort to explain the fiber whipping motion. 49 The PIV technique involves emitting numerous tracer particles into the air flow field and then using a pulsed laser beam to detect their trajectory. PIV helps visualize the structure of the turbulent air flow and measure the spatial distribution of the velocity at any time instance.…”

Section: ■ Overviewmentioning

confidence: 99%

Advances in Melt Blowing Process Simulations

Schmidt

Usgaonkar

Kumar

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Melt blowing is a widely used process for manufacturing nonwoven fiber products with applications spanning healthcare, agriculture, transportation, and infrastructure, among others. The process includes extrusion of a polymer melt through orifices, drawing fiber using high-speed air jets, solidification by cooling with entrained ambient air, and collection in the form of a fiber mat. The structural features and properties of the final mat are determined by a complex interplay between materials selection and fiber dynamics, air flow, and temperature characteristics from die to collector. For the latter, both process variable values and geometrical factors have substantial influence. Many experimental investigations have advanced fundamental understanding in this area, but these studies are challenging due to high air velocities, high temperatures, and the often space-constrained nature of the process, especially near the die exit. Such complexities have sparked significant interest in developing mathematical models and using computer simulations to reveal deeper fundamental insights. Herein, we review advances in melt blowing simulations by presenting employed methods and key findings in the area. We finish by describing some challenges and opportunities for further research.

show abstract

Particle Image Velocimetry (PIV) Investigation of the Turbulent Airflow in Slot-Die Melt Blowing

Cited by 12 publications

References 31 publications

Measurement and Comparison of Melt-Blowing Airflow Fields: Nozzle Modifications to Reduce Turbulence and Fibre Whipping

Measurement and Comparison of Melt-Blowing Airflow Fields: Nozzle Modifications to Reduce Turbulence and Fibre Whipping

Airflow, Fiber Dynamic Whipping, and Final Fiber Diameter in Flush Sharp-Die Melt Blowing with Different Air-Slot Widths

Advances in Melt Blowing Process Simulations

Contact Info

Product

Resources

About